基于NS的Ad hoc路由协议研究

在分析Ad Hoc无线网络基本特性的基础上,综合评述Ad Hoc网络路由协议主要的研究现状,讨论Ad Hoc无线网络路由协议的发展趋势和挑战。对几种典型的Ad Hoc网络路由协议的特点进行分类分析和比较,着重分析AODV,DSDV,DSR等3种协议的特点及路由机制,并使用NS2仿真软件对其仿真,再从仿真结果中分析数据,绘出图表进行比较。     

粘土力学强度分层中的模糊数学模型

本文依据宁波北仑港海上大量的粘性土工程地质勘察资料和土工试验数据,以传统地质分层为背景,力学强度分层为目标,建立了一套模糊数学评判模型,并用计算机进行数据处理,定量地划分了粘性土的力学强度。     

适合CDMA移动自组网的多用户检测算法及应用研究

Throughput of mobile ad hoc network （MANET） is limited by collision avoidance. In CDMA-based MANET, this limitation can be overcome by multiuser detection （MUD） because conventional colliding packets can be detached and detected by MUD so that multi-packet reception （MPR） is possible. This paper introduces the principles of MUD algorithm for MANET, and proposes an adaptive blind MUD algorithm. A special medium access control （MAC） protocol is designed to make MANET more efficient. This is achieved by sending more packets to a destination simultaneously. The proposed MUD algorithm and MAC protocol allow CDMA-based MANET to support MPR. Simulations show a remarkable improvement in the throughput performance of MANET.     

国外群体记忆研究概述

群体记忆(collective memory)是社会心理学研究中一个十分特别的领域,其主要特点在于研究所涉及的领域十分宽泛,因而跨学科特征明显.而且同其它边缘性的课题一样,与群体记忆相关的研究成果均与社会现实有着紧密联系,因而具有极大的现实意义.现阶段,我国学者应该结合国际上已有的相关研究,尽快熟悉群体记忆研究的研究方法,吸收已有成果,并根据我国社会实际状况找到适合国情的群体记忆研究方式.     

Secure and efficient multi-message and multi-receiver ID-based signcryption for rekeying in ad hoc networks

In this paper, the security technology of ad hoc networks is studied.To improve the previous multi-receiver signcryption schemes, an ID-based multi-message and multi-receiver signcryption scheme for rekeying in ad hoc networks is proposed.In this scheme, a sender can simultaneously signcrypt n messeges for n receivers, and a receiver can unsigncrypt the ciphertext to get his message with his own private key.An analysis of this scheme indicates that it achieves authenticity and confidentiality in the random oracle model while being of lower computation and communication overhead.Finally, for the application of our scheme in ad hoc, a threshold key updating protocol for ad hoc networks is given.     

无线网状网的轻便身份认证协议研究

分析了近期无线网络发展所带来的影响以及相关的技术改进和缺点,发现节点身份验证虽然已经取得改善,但是还是有一些能量优化方面带来的问题。提出网状节点移动时候的身份验证问题解决方案,通过该方案,外域和家域在没有取得联系的时候也可以进行相关认证,从而改善能量方面带来的一些安全问题。     

Library of Congress Subject Headings

No abstract available for this article.     

Motivations for Library Use: Dover,Delaware, Library User Identity‐Motivation Pilot Study,December 2005

Under State Librarian Annie Norman, the Delaware Division of Libraries (DDL) has made notable progress in planning, measuring and advocating for programs and funds that have improved the libraries of that state. A visit to the state library's homepage (http://state.lib.de.us) immediately demonstrates the DDLS sense of purpose in the tagline motto, Delaware Libraries: Infrastructure + Capacity = Sustainability. DDL planning is ongoing, including a 2008 plan to move all the state's libraries forward in the critical areas of economic development, lifelong learning and health information. One document in this planning process was the 2005 pilot study to examine and categorize the motivations for why individuals use the public library. It is that study, a market segmentation study of the reasons why people use the library, that is published here. The study that is the basis for this report was produced under contract by the Institute for Learning Innovation (http://www.ilinet.org/display/ILI/Home). DDL would like to give a special thank you to Dr. John Falk of the Institute for Learning Innovation for his significant help with this study. Presented here in its entirety, the study report can be found on the Delaware Division of Library Services Web site at http://state.lib.de.us/For_libraries/planning/Dover%20Library%20Pilot%20Study%20Final%20Report1.pdf. The editors gratefully acknowledge the willingness of Delaware State Librarian Annie Norman and the Delaware Division of Libraries for the right to reprint this significant methodological example for PLQ readers.

The study is based on two surveys: the first a “user interception survey” of 113 pre and post interviews collected at the Dover Public Library across 20 hours through one week in November of 2005. The second part of the study involved follow‐up telephone interviews with over 25 percent of those who had participated in the first study.     

一种高速大规模Ad Hoc网络下OLSR协议软件设计方案

在高速大规模Ad Hoc网络环境下,提出一种基于用户模式的OLSR协议软件的整体架构方案,方案定义软件的实现方案及软件框架.软件框架的设计借鉴TCP/IP协议栈的分层设计思想,解决移植性问题.算法重新设计节点之间的管理关系结构,并通过使用静态路由和OLSR路由相结合的方式,提高在高速大规模Ad Hoc网络中数据传输的性能.     

基于主体功能区的土地利用分区研究——以内蒙古自治区为例

划分土地利用分区对科学制定土地利用方向、合理确定土地利用结构、提高土地利用集约化程度、促进区域协调发展具有重要意义。本文在总结前人开展的内蒙古自治区土地利用分区的基础上,充分考虑内蒙古自治区主体功能区规划确定的主体功能区对土地利用分区划分的影响,土地利用分区应有利于促进主体功能区形成的前提下,提出基于主体功能区的自治区土地利用分区构想,将自治区土地利用划分形成耕地与基本农田集中区、城镇村发展区、工矿建设区和生态安全保护与建设区4个土地利用功能区。